Craftsman 917276391 tractor Parts

Replacing the engine on your Craftsman riding tractor model 917276391 is worth it when the mower deck, transmission, and steering are in solid shape and the total engine swap cost stays well below the cost of a comparable new tractor. If the chassis is worn out or multiple major systems need work, replacement usually makes more sense.

Quick decision checklist

• The mower deck is not rusted through and still cuts evenly after cleaning and leveling.
• The tractor drives smoothly (no slipping, grinding, or loss of power).
• Steering and front axle feel tight (no excessive play).
• You can do the work safely (blades are sharp; engine parts get hot; keep the machine clear of debris).
• The engine replacement cost (engine, hardware, fluids, belts) is less than about half the price of a similar new rider.

Cost and effort: what to compare

Option	Best when	What you gain	What to watch for
Replace engine	Tractor is otherwise in good condition	Fresh reliability, often a warranty	Labor time, wiring and throttle/choke setup
Repair existing engine	Issue is limited (starter, carburetor, fuel system)	Lowest cost	Can become a repeat repair cycle
Replace tractor	Deck/chassis/transmission are worn	New machine, less downtime	Higher upfront cost

Before you commit: rule out common “no start” causes

Many “bad engine” symptoms are actually starting or fuel issues. Check these first:

• Battery and cable connections (clean and tight)
• Safety interlock switches and wiring
• Fresh fuel and a clean air filter
• Spark plug condition and secure plug wire
• Starter circuit issues (clicking, no crank)

If you suspect a starting circuit problem, use riding lawn mower engine clicks but doesnt turn over video to narrow it down.

Why it matters

An engine swap can be a smart investment, but only if the rest of the tractor is safe and dependable. The operator safety guidance and maintenance checks in the 917276391 owner's manual help you evaluate the machine’s overall condition before putting money into a major repair.

Last updated: January 2026

For Craftsman lawn tractor model 917276391, the operator’s manual identifies it as an 18.0 HP, 42-inch mower tractor with electric start and a 6-speed transaxle; the manual does not specify the engine brand on the cover page. For the exact engine make and model, use the engine identification information in the 917276391 owner's manual.

How to identify the exact engine on your tractor

We use the engine’s ID tag (not the tractor model number) to match the correct tune-up and repair parts.

• Park on a flat surface, set the parking brake, and remove the key.
• Lift the hood and locate the engine ID label (often on the blower housing, valve cover, or near the starter).
• Write down the engine model, type, and code (or spec number).
• Match those numbers when ordering engine parts (air filter, spark plug, fuel filter, starter, carburetor parts).
• If the label is dirty, wipe it gently so the numbers are readable.

What we can confirm from the manual for 917276391

The manual cover provides these model-level specs:

Item	What it tells you	Why it helps
Horsepower rating	18.0 HP	Confirms power class for maintenance expectations
Mower deck size	42 in	Helps match blades, belts, and deck parts
Starting system	Electric start	Points to battery, solenoid, and starter circuit parts
Transmission	6-speed transaxle	Helps when diagnosing drive and shifting issues

Why it matters

The tractor model 917276391 tells us the chassis and deck family, but the engine model tag is what ensures you get the right ignition, fuel, and starting components. For example, a no-crank symptom often leads to testing the battery and starter circuit, including the lawn tractor starter solenoid 582042802.

Last updated: January 2026

A Craftsman “6.75” walk-behind mower and a Craftsman riding lawn tractor are different products, so the model number depends on which machine you have. For the Craftsman riding lawn tractor covered by this page, the model number is 917.27639 (also shown as 917276391 on parts listings); confirm it on the ID label and in the 917276391 owner's manual.

How to find the correct model number on your mower

Use the model number from the product ID label, not the engine cover decal.

• Look for a sticker or plate under the seat, on the frame near the engine, or by the rear fender (riding tractors).
• For walk-behind mowers, check the rear deck, near the wheels, or behind the engine.
• Write down the full model number exactly as shown (all digits, no missing characters).
• Use the model number to match parts like blades, belts, and filters.

“6.75” usually is not the model number

On many Craftsman walk-behind mowers, 6.75 refers to the engine rating/series, not the mower’s model number. The mower model number is typically a longer number (often starting with 917).

Quick comparison

What you see	What it means	What to use for parts
6.75	Engine rating/series	Mower model number from ID label
917.27639 / 917276391	Riding tractor model identifier	Use for this tractor’s parts

Why it matters

Using the correct model number prevents ordering the wrong blade, deck belt, or electrical parts. For example, this tractor commonly uses deck-related parts like a v-belt 532138255 and specific 42-inch deck blades.

Last updated: January 2026